| | 2020 | | | | | | | | | | | 98.8% PM2.5 10 | / | | | | | 45 | 12 | | 12 | | | | | | | | 2016 | 2018 | | | 42 | 2017 | 22 | | 35 | 34 | | 305 | 235 197 | 83.8% |